I think it spreads exp through all of your party Pokemon
yes you can :)
You cant get it in Pokemon Yellow as it was only introduced in Pokemon Firered, and LeafGreen. You can get exp all though in Pokemon yellow.
It might be because the Pokemon that battled is one you got by trading. Like.. I have a kadabra that I traded in pearl for a machop. So my kadabra will gain more EXP then the one you catched. Pokemon you traded always grwo stronger and gain more EXP.
give the exp share to a weak Pokemon when you use any Pokemon to fight exp goes to the fighting Pokemon and the 1 with the exp share.
If your training a Pokemon that was traded to you that Pokemon receives boosted exp points also if the Pokemon holds a lucky egg it can receive even more exp points.
You can give the pokemon a Lucky Egg (which boosts exp gain by 20%), or simply face trainers and not wild pokemon, because trainers give out more exp.
If the last 3 digits match you get exp share. The more IDs you have in your boxes the higher chance you have of winning
you could switch Pokemon in battle then all Pokemon that battled get exp or you could get the exp share and give it to one of your Pokemon
The more you walk around (1 step in one EXP) the more EXP it will get.1 step = 1 exp, 10 steps = 10 exp, 100 = 100 exp and so on.
Nope
Its a item that you give to a Pokemon and it gives the Pokemon that you gave the exp share to exp points to help a Pokemon gain levels